First you should take out the common factor. After you do that, in this case you have a difference of square, so you can use the formula for a difference of squares.
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3X2 + 6X + 9 3(X2 + 2 + 3) -----------------------3 is a common factor of all terms
x3 - 3x2 + x - 3 = (x - 3)(x2 + 1)
Multiplicand or factor.
(3x + 1)(x + 5)
3(x + 7)(x - 8)